Description

Megger TTRU1-BASIC
- Designed to test distribution, instrument (CTs and PT/VTs), and power transformers
- Perform routine polarity validation and turns ratio tests
- Easy-to-follow setup ensures the right result the first time
- Click start and perform over 1000 turns ratio tests on a single NiMH AA battery charge
- Maximum induced voltage: 37.5V
Handheld Transformer Turns Ratiometer (37.5V Max Induced Voltage)
Power through transformer electromechanical tests with the new TTRU1, the latest handheld transformer turns ratiometer from Megger. Perform routine polarity validation and turn ratio tests on power, distribution, and instrument transformers.
Model | TTRU1-BASIC | TTRU1-ADV |
Full-colour Hi-bright LCD screen | ✓ | ✓ |
Max turns ratio | 50,000 Down | 50,000 Down |
Max induced voltage | 37.5V | 62.5V |
Max current | 1A | 1A |
Pass/Fail ratio evaluation | ✓ | ✓ |
Additive/Subtractive polarity validation | ✓ | ✓ |
Excitation current measurements | ✓ | ✓ |
Automatic results storage | ✓ | ✓ |
Auto dim and power off battery saving | ✓ | ✓ |
Self-check diagnosis | ✓ | ✓ |
USB drive save and export | ✓ | ✓ |
Battery-operated NiMH or alkaline | ✓ | ✓ |
USB-C NiMH battery charging | ✓ | ✓ |
Soft carry bag with belt loop hook | ✓ | ✓ |
Microsoft Excel export | ✓ | ✓ |
PowerDB Import | Not included | ✓ |
Go/No Go short circuit, open circuit, inductance | Not included | ✓ |
Customizable transformer vector list and voltages | Not included | ✓ |
USB printer | Optional | Optional |
Hand crank/solar battery charger pack | Optional | Optional |
TTR – Turns ratio testing
When compared to other single-phase turns ratio test instruments, the TTRU1 is easier to use as you don’t need to know the proper test voltage to obtain a valid test result.
The TTRU1 uses the latest technological advancements, providing safe, repeatable, and reliable results.

Additive/Subtractive polarity recognition
Polarity recognition provides confidence in transformer results by performing vector group validation during every test. Results on the screen show if the connected distribution transformer is additive or subtractive.
Excitation current
Included with the TTR test, the excitation current test is extremely useful in locating problems such as defects in magnetic core balance, magnetic core structure, shifting windings, failures in turn-to-turn insulation, or problems in tap changers.
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